﻿using SoTaySinhVienUIT.Data;
using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Windows.ApplicationModel.Activation;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Popups;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;

// The Search Contract item template is documented at http://go.microsoft.com/fwlink/?LinkId=234240

namespace SoTaySinhVienUIT {
    /// <summary>
    /// This page displays search results when a global search is directed to this application.
    /// </summary>
    public sealed partial class SearchResultsPage : SoTaySinhVienUIT.Common.LayoutAwarePage {

        public SearchResultsPage() {
            this.InitializeComponent();
        }

        /// <summary>
        /// Populates the page with content passed during navigation.  Any saved state is also
        /// provided when recreating a page from a prior session.
        /// </summary>
        /// <param name="navigationParameter">The parameter value passed to
        /// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested.
        /// </param>
        /// <param name="pageState">A dictionary of state preserved by this page during an earlier
        /// session.  This will be null the first time a page is visited.</param>
        protected override async void LoadState(Object navigationParameter, Dictionary<String, Object> pageState) {

           try {
                await SampleDataSource.LoadData();
                var queryText = navigationParameter as String;

                // TODO: Application-specific searching logic.  The search process is responsible for
                //       creating a list of user-selectable result categories:
                //
                //       filterList.Add(new Filter("<filter name>", <result count>));
                //
                //       Only the first filter, typically "All", should pass true as a third argument in
                //       order to start in an active state.  Results for the active filter are provided
                //       in Filter_SelectionChanged below.

                var filterList = new List<Filter>();
                filterList.Add(new Filter("All", 0, true));

                var groups = SampleDataSource.GetGroups("AllGroups");
                string query = queryText.ToLower();
                var all = new List<SampleDataItem>();
                _results.Add("All", all);

                foreach (var group in groups) {
                    var items = new List<SampleDataItem>();
                    _results.Add(group.Title, items);

                    // search topic favorite

                    if (group.UniqueId.Equals("FAVORITE_GROUP")) {
                        if (group.Items.Count > 0) {
                            if (!group.Items[0].UniqueId.Equals("NOTHING_FAV")) {
                                foreach (var item in group.Items) {
                                    if (item.Title.ToLower().Contains(query) || item.Description.ToLower().Contains(query)) {
                                        all.Add(item);
                                        items.Add(item);
                                    }
                                }
                            }
                        }
                    }

                    // search item favorite

                    if (group.UniqueId.Equals("FAVORITE_GROUP_ITEM")) {
                        if (group.Items.Count > 0) {
                            if (!group.Items[0].UniqueId.Equals("NOTHING_FAV_ITEM")) {
                                foreach (var item in group.Items) {
                                    if (item.Title.ToLower().Contains(query) || item.Description.ToLower().Contains(query)) {
                                        all.Add(item);
                                        items.Add(item);
                                    }
                                }
                            }
                        }
                    }

                    // search note

                    if (group.UniqueId.Equals("FAVORITE_GROUP_ITEM_NOTE")) {
                        if (group.Items.Count > 0) {
                            if (!group.Items[0].UniqueId.Equals("NOTHING_FAV_ITEM_NOTE")) {
                                foreach (var item in group.Items) {
                                    if (item.Note.ToLower().Contains(query)) {
                                        all.Add(item);
                                        items.Add(item);
                                    }
                                }
                            }
                        }
                    }

                    // search topic

                    if (!group.UniqueId.Contains("FAVORITE")) {
                        foreach (var item in group.Items) {
                            if (item.Title.ToLower().Contains(query) || item.Description.ToLower().Contains(query)) {
                                all.Add(item);
                                items.Add(item);
                            }
                        }
                    }

                    // search item

                    if (!group.UniqueId.Contains("FAVORITE")) {
                        var all_item = SampleDataSource.GetGroups("AllGroups")
                            .Where(t => !t.UniqueId.Contains("FAVORITE"))
                            .SelectMany(t => t.Items)
                            .SelectMany(i => (i as SampleDataTopic).Items);

                        foreach (var item in all_item) {
                            if (item.Title.ToLower().Contains(query) || item.Description.ToLower().Contains(query)) {
                                all.Add(item);
                                items.Add(item);
                            }
                        }
                    }

                    if (items.Count > 0) {
                        filterList.Add(new Filter(group.Title, items.Count, false));
                    }
                }

                filterList[0].Count = all.Count;

                // Communicate results through the view model
                this.DefaultViewModel["QueryText"] = '\u201c' + queryText + '\u201d';
                this.DefaultViewModel["Filters"] = filterList;
                this.DefaultViewModel["ShowFilters"] = filterList.Count > 1;
            }
            catch (Exception exp) {               
            }
            
        }

        /// <summary>
        /// Invoked when a filter is selected using the ComboBox in snapped view state.
        /// </summary>
        /// <param name="sender">The ComboBox instance.</param>
        /// <param name="e">Event data describing how the selected filter was changed.</param>
        void Filter_SelectionChanged(object sender, SelectionChangedEventArgs e) {
            // Determine what filter was selected
            var selectedFilter = e.AddedItems.FirstOrDefault() as Filter;
            if (selectedFilter != null) {
                // Mirror the results into the corresponding Filter object to allow the
                // RadioButton representation used when not snapped to reflect the change
                selectedFilter.Active = true;

                // TODO: Respond to the change in active filter by setting this.DefaultViewModel["Results"]
                //       to a collection of items with bindable Image, Title, Subtitle, and Description properties

                try { this.DefaultViewModel["Results"] = _results[selectedFilter.Name]; }
                catch (Exception exp) {
                }

                // Ensure results are found
                object results;
                ICollection resultsCollection;
                if (this.DefaultViewModel.TryGetValue("Results", out results) &&
                    (resultsCollection = results as ICollection) != null &&
                    resultsCollection.Count != 0) {
                    VisualStateManager.GoToState(this, "ResultsFound", true);
                    return;
                }
            }

            // Display informational text when there are no search results.
            VisualStateManager.GoToState(this, "NoResultsFound", true);
        }

        /// <summary>
        /// Invoked when a filter is selected using a RadioButton when not snapped.
        /// </summary>
        /// <param name="sender">The selected RadioButton instance.</param>
        /// <param name="e">Event data describing how the RadioButton was selected.</param>
        void Filter_Checked(object sender, RoutedEventArgs e) {
            // Mirror the change into the CollectionViewSource used by the corresponding ComboBox
            // to ensure that the change is reflected when snapped
            if (filtersViewSource.View != null) {
                var filter = (sender as FrameworkElement).DataContext;
                filtersViewSource.View.MoveCurrentTo(filter);
            }
        }

        /// <summary>
        /// View model describing one of the filters available for viewing search results.
        /// </summary>
        private sealed class Filter : SoTaySinhVienUIT.Common.BindableBase {
            private String _name;
            private int _count;
            private bool _active;

            public Filter(String name, int count, bool active = false) {
                this.Name = name;
                this.Count = count;
                this.Active = active;
            }

            public override String ToString() {
                return Description;
            }

            public String Name {
                get { return _name; }
                set { if (this.SetProperty(ref _name, value)) this.OnPropertyChanged("Description"); }
            }

            public int Count {
                get { return _count; }
                set { if (this.SetProperty(ref _count, value)) this.OnPropertyChanged("Description"); }
            }

            public bool Active {
                get { return _active; }
                set { this.SetProperty(ref _active, value); }
            }

            public String Description {
                get { return String.Format("{0} ({1})", _name.Substring(0, _name.Length < 15 ? _name.Length : 15) + "...", _count); }
            }
        }

        private void resultsGridView_ItemClick(object sender, ItemClickEventArgs e) {
            if (((SampleDataCommon)e.ClickedItem).UniqueId.Contains("GROUP")) {
                var group = e.ClickedItem as SampleDataGroup;

                this.Frame.Navigate(typeof(SplitPage), group.UniqueId);
            }

            if (((SampleDataCommon)e.ClickedItem).UniqueId.Contains("TOPIC")) {
                var topic = e.ClickedItem as SampleDataTopic;
                if (topic.Items.Count > 0) {
                    this.Frame.Navigate(typeof(ItemsPage), topic.UniqueId);
                }
                else {

                    var group = topic.Group;

                    var dic = new Dictionary<String, String>(){
                                {"group_id", ((SampleDataGroup)group).UniqueId},
                                {"item_id", topic.UniqueId}
                            };

                    this.Frame.Navigate(typeof(SplitPage), dic);
                }
            }

            if (((SampleDataCommon)e.ClickedItem).UniqueId.Contains("ITEM")) {
                var group = ((SampleDataItem)e.ClickedItem).Topic;

                var dic = new Dictionary<String, String>(){
                            {"topic_id", ((SampleDataTopic)group).UniqueId},
                            {"item_id", ((SampleDataItem)e.ClickedItem).UniqueId}
                        };

                this.Frame.Navigate(typeof(SplitPage), dic);
            }
        }

        private Dictionary<string, List<SampleDataItem>> _results = new Dictionary<string, List<SampleDataItem>>();

        private void btnHome_Click(object sender, RoutedEventArgs e) {
            this.Frame.Navigate(typeof(TopicGroupedPage), "AllGroups");
        }

    }
}
